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Commit a657db03 authored by Neal Cardwell's avatar Neal Cardwell Committed by David S. Miller
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tcp: more accurately check DSACKs to grow RACK reordering window



Previously, a DSACK could expand the RACK reordering window when no
reordering has been seen, and/or when the DSACK was due to an
unnecessary TLP retransmit (rather than a spurious fast recovery due
to reordering). This could result in unnecessarily growing the RACK
reordering window and thus unnecessarily delaying RACK-based fast
recovery episodes.

To avoid these issues, this commit tightens the conditions under which
a DSACK triggers the RACK reordering window to grow, so that a
connection only expands its RACK reordering window if:

(a) reordering has been seen in the connection
(b) a DSACKed range does not match the most recent TLP retransmit

Signed-off-by: default avatarNeal Cardwell <ncardwell@google.com>
Acked-by: default avatarYuchung Cheng <ycheng@google.com>
Acked-by: default avatarPriyaranjan Jha <priyarjha@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 63f367d9
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